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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW " title="NEW --- - AVX512: scalar FMA 132/231 instructions are not supported" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D23937&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=jP1cEyAc2hMRxcl4Cr19viiAKneR5rs7kXYDHbSQo-o&s=hbpjI1S_HHQBDA_2t_qrmwLw8u5ukeTTNur7UoUWOpo&e=">23937</a>
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<th>Summary</th>
<td>AVX512: scalar FMA 132/231 instructions are not supported
</td>
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<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Backend: X86
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>ahmed.bougacha@gmail.com
</td>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Consider:
$ echo '0x62 0xf2 0xf5 0x08 0xa9 0xc2' | ./bin/llvm-mc -disassemble
.section __TEXT,__text,regular,pure_instructions
vfmadd213sd %xmm2, %xmm1, %xmm0
Replacing 0xa9 (213) with 0xb9 (231) or 0x99 (132) doesn't work:
$ echo '0x62 0xf2 0xf5 0x08 0x99 0xc2' | ./bin/llvm-mc -disassemble
.section __TEXT,__text,regular,pure_instructions
<stdin>:1:1: warning: invalid instruction encoding
0x62 0xf2 0xf5 0x08 0x99 0xc2
^
<stdin>:1:26: warning: invalid instruction encoding
0x62 0xf2 0xf5 0x08 0x99 0xc2
^</pre>
</div>
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